Fix show --all showing only the installed version if the package is installed, fixes #10095

src/Composer/Command/ShowCommand.php

@@ -27,6 +27,7 @@ use Composer\Plugin\PluginEvents;
 use Composer\Repository\InstalledArrayRepository;
 use Composer\Repository\ComposerRepository;
 use Composer\Repository\CompositeRepository;
+use Composer\Repository\FilterRepository;
 use Composer\Repository\PlatformRepository;
 use Composer\Repository\RepositoryFactory;
 use Composer\Repository\InstalledRepository;
@@ -184,7 +185,7 @@ EOT
             } else {
                 $installedRepo = new InstalledRepository(array($localRepo, $platformRepo));
             }
-            $repos = new CompositeRepository(array_merge(array($installedRepo), $composer->getRepositoryManager()->getRepositories()));
+            $repos = new CompositeRepository(array_merge(array(new FilterRepository($installedRepo, array('canonical' => false))), $composer->getRepositoryManager()->getRepositories()));
         } elseif ($input->getOption('all')) {
             $defaultRepos = RepositoryFactory::defaultRepos($io);
             $io->writeError('No composer.json found in the current directory, showing available packages from ' . implode(', ', array_keys($defaultRepos)));